I use my cutting table to sandwich quilts. It's one similar to those sold at JAF with the fold down sides. I have done from table runners to large king quilts on this table.
I place my backing centered on the table, smoothed and then clamp it in place with large binder clips. Then batting centered. Using the same binder clips, clamp that down. Repeat with top. I place 3 clips on each side and 2 clips on each end. I normally pin baste about a hand-width apart in all directions. I've learned, though, that when doing a large king, thread basting makes the whole sandwich might lighter to deal with.